Iid lindner



E. LINDNER. GL01 B (EASTER.

Pdt'en'ted Feb. 26, 1861.

EDWARD LINDNER, OF NEW YORK, N. Y.

FURNITURE-(EASTER.

Specification of Letters PatentQNo.

To all whom 'it may concern:

Be it known that I, EDWARD LINDNER, of

the city, county, and State of New York,

have invented new and useful Improvements in Globe-Casters; and I herebydeclare that the following is a full and clear will admit of thesubsequent cooling and contraction.

description of the same, reference being had to the accompanyingdrawing, in which Figures 1, 2, 3, 4, 5, 6,7 and 8, represent Views inelevation, invention together with modifications of the same.

The nature of my invention consists in the peculiar construction of theglobe containing socket and in the means employed to keep the globewithin the socket whereby a cheaper and more durable article is\produced while a greater perfection of its operation is attained.

In Fig. l the socket is made solid with the screw that fastens it withthe leg of the 7 table, chair or other furniture to which it is applied.The peculiarity of this socket consists in the formation of theconcavity of the socket which is elliptical or oval or otherwisesimilarly shaped so that the plane of its greatest axis shall coincidewith that of the globe, the socket at the same time being in tangentialcontact with the top of the globe. The opening ofthe socket at the underside thereof is circular of a diameter somewhat smaller than that of theglobe.

To insert the globe within the socket, the latter is heated when, by itsexpansion it globe and imprison it by By this construction of thesocket, the globe, when in operation, will have but one point of contactwithin the socket which is diametrically opposite to that without thesocket.

In Fig. 2 the socket and the screw are distinct from each other and maybe made of different materials according to the strength required andconvenience of manufacture. The socket may be made of brass or othermalleable material and is provided with hooks that may be bent inwardafter insertion of the globe within the socket.

' tical or oval the longer axis passing through The peculiarity in thiscaster consists in the oblong shape of its cavity it being ellipf "theopening in the top of the socket. In connection with this socket is useda round "headed screw so that the globe comes in contact with the headof the screw only.

The operation of this caster is similar to section and detail ofmyeaseejaatea February 26, 1861.

that of the former. For heavy furniture in which casters of greaterstrength are to be used, I construct the globe with recesses over itssurface the object being to give it a greater hold on the floor byincreasing its surface of contact. The socket is or maybe constructed inthe same manner as the one hereinhcfore described with the exception ofthe screw, which in this case, instead of being convex shaped at thehead is provided with a cavity corresponding more or less .with theconvexity of the globe. It will. be

evident that the recessed portion of the globe has no bearing whatevermthe socket,

while it affords an increased friotitmal.hold. c;-

on the fioor particularly when carpeted.

In Fig. 4 the socket is cast arouiul a screw having a flat steel head ora head hardened by temper. At a a depression is shown as applied to theshank of the screw whereby it is prevented from turning within thesocket.

The globe which may be made of metal, steel, porcelain or glass bearsagainst the head of the screw and has therefore but one point ofcontact. The cavity of the socket is moreover provided, in its u perportion, with a projecting rim which may he circular, oval, orpolygonal, as shown in Figs. 5, 6, 7, which represent plan views of thecavity. The object of this rim is to facilitate theirotation of the ballor globe around its horizontal axis by applying a force erresistancecreated by friction on the one side of the globe only while at the sametime the opposite side is left entirely fr and out of contact and thusacting on the hall with a,

leverage as it were to cause its rotation in any desired plane andthereby answering the conditions of a'caster in the most perfect manner.

It is evident from the above that the irim should be of such developmentor of such diameter as to allow the ball freely to play within. and tocome in contact with the ball at one pointthereof when motion. isimparted to the piece of furniture that is provided with it.

The socket I prefer to make of two pieces so as to enable any one toremove the ball for the purpose of cleaning or to sul'wstitute thereforanother and lastly to securely confine the ball within the socket. Forthis purposehooks or pins are cast to the upper half and angular slotsare cut in the lower part of the socket or cap piece. This mode iii .Lea:

of fastening may be modified. and'constructed in different manners.

During the operation of this caster, dust, fibers of carpet etc. arecarried along by the ball and produce the clogging up of the socket. Toavoid this I cut a hole in the upper part of the socket and through it.By this means the dirt is worked out of the socket which is therebypreserved clean and perfection of its operation secured.

WVhen glass globes are used I prefer to remove the superficial glazeeither by mechanical means 2'. c. by grinding them upon emery wheels orshaking the glass balls in drums containing emery or by chemical means2'. e. by dlpping the balls in strong acid such as fluoric acid, inorder to give more adhesion to the floor or carpet.

Having thus described my invention and several modifications thereof Ishall confine the claims of this application to the followmg:

1. In a socket the concavity of which is fOiIilcCl of an elliptical ovalor other equivalent form and the orifice or rimof which is of a diametersmaller than that of the globe, whereby the globe may be inserted w1th1nthe socket by the application of heat substantially as described.

2. In combination with the studs or plns in the upper part of thesocket, I claim the angular slot in the cap piece for the purposesdescribed.

3. In con'ihination with a socket cast' in one piece with the screw orother appliance for fastening the caster to a piece of furniture, Iclaim. forming the concavlty of an elliptical oval or other equivalentform whereby the globe will have but one pomt of contact within thesocket which is diametrically opposite to its point of contact with thefloor.

In testimony whereof I have hereunto subscribed my name.

EDWARD LINDNER. Witnesses:

S. H. MAYN RD, JOHN R. PECKI-IAM.

